Fatal error: Uncaught Error: Class "Doctrine\ORM\Mapping\Driver\YamlDriver" not found in /var/www/apache/dev/cal/web/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/Driver/SimplifiedYamlDriver.php:31 Stack trace: #0 {main} thrown in /var/www/apache/dev/cal/web/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/Driver/SimplifiedYamlDriver.php on line 31